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Part 2: Wheel bearing housing, wheel bearing unit, trailing arm with mounting bracket > < Vehicle level sender (overview)

A3 Mk2

Removing and installing rear left vehicle level senderG76 and rear right vehicle level senderG77 (on vehicle)
Removing and installing rear left vehicle level sender -G76- and rear right vehicle level sender -G77- (on vehicle)
Special tools and workshop equipment required
t  Torque wrench -V.A.G 1331-
General notes:
Vehicles with electronic damping control (Audi magnetic ride) and/or gas discharge headlights have automatic headlight range control fitted as standard equipment → Rep. gr.94.
The electronic damping control (Audi magnetic ride) and the automatic headlight range control functions require information on the compression and rebound travel at the front and rear suspension.
For this purpose, the position of the left/right transverse link in relation to the body is transferred to the rear left vehicle level sender -G76- and the rear right vehicle level sender -G77- via a coupling rod. The senders then transmit electrical signals to the electronically controlled damping control unit -J250- and/or the gas discharge light control units (left/right) -J343/344-.
Servicing left/right gas discharge bulb control unit -J343/344- → Rep. gr.94
On the front axle these signals are supplied by the front left vehicle level sender -G78- and front right vehicle level sender -G289- to the electronically controlled damping control unit -J250- and/or the gas discharge light control units (left/right) -J343/344-.
These signals are required for calculating the current attitude of the vehicle.
The automatic headlight range control reacts to changes in the suspension height (attitude of the vehicle).
The following situations may produce a change in the suspension height:
t  Towing a trailer/caravan
t  Different loads (vehicle unladen, partly laden or fully laden)
  Note
The basic headlight setting must always be checked and, on vehicles with electronic damping control (Audi magnetic ride), the reference position of the suspension must always be re-adapted in the following cases:
t  If work has been performed on the vehicle level sender,
t  If the lower transverse link has been removed and installed,
   
t  If bolted connections -2- or -3- have been slackened
  Note
t  On vehicles with electronic damping control (Audi magnetic ride), lower bracket for vehicle level sender is secured to lower transverse link with two bolts -2-.
t  On vehicles with headlight range control, lower bracket for vehicle level sender is secured to lower transverse link with three bolts -2-.
The vehicle level sender is only available as a replacement part complete with coupling rod and upper and lower retaining plates.
–  On vehicles with electronic damping control (Audi magnetic ride), re-adapt reference position → Vehicle diagnostic tester.
Basic setting of headlights → Rep. gr.94
  A42-0447
Removing
–  Unplug connector -1-.
–  Remove bolts -2- and -3-.
–  Take out sender.
Installing
Installation is carried out in the reverse sequence. Note the following points:
Tightening torques → Anchor
Lever on sender must face outwards.
–  On vehicles with electronic damping control (Audi magnetic ride), re-adapt reference position → Vehicle diagnostic tester.
–  Perform basic setting of headlights → Rep. gr.94.
Tightening torques → Item.
  A42-0447

Part 2: Wheel bearing housing, wheel bearing unit, trailing arm with mounting bracket > < Vehicle level sender (overview)